Senior Network Defense Design Engineer

Posted 4 Days Ago
Be an Early Applicant
Quantico, VA, USA
In-Office
108K-195K Annually
Senior level
Information Technology • Software
The Role
The engineer will manage information systems, implement security measures, develop policies, oversee network defense, and ensure compliance with security standards.
Summary Generated by Built In

Unleash Your Potential

At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customer’s success. We empower our teams, contribute to our communities, and operate sustainably. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community. Our Mission, Vision, and Values guide the way we do business.

If this sounds like an environment where you can thrive, keep reading!

The Mission

The Leidos team delivers the core backbone of the Service, Management, Integration and Transport (SMIT) program, including cybersecurity services, network operations, service desk, and data transport. Leidos will support network modernization efforts to provide Sailors, Marines and the civilian workforce with the tools they need to be more efficient at increasing naval capabilities and further empowering the Navy Marine Corps team to compete and win.

Your Main Objective

  • Assist the Government Lead in the daily engineering duties on systems. Operate and manage all aspects of Information Systems, data availability, integrity, authentication, confidentiality, and non-repudiation. Implement and monitor security measures for communication systems, networks, and provide advice that systems and personnel adhere to established Government security requirements.

  • Develop and execute security policies, plans, and procedures.

  • Develop Continuity of Operations Plan/Disaster Recovery (COOP/DR) plans and support certification of Information Systems and Networks.

  • Operate and Design Enterprise solutions for Logging, Forensics, Security Incident and Event Management (SIEM), and Design Network Access Control (NAC).

  • Design and implement the Enterprise Services portion of the Sensor Grid within the security infrastructure that collects intrusion, incident, and audit data from a collection of sources including, but not limited to, Content Monitoring products, Content Filtering products, Host Based Security System (HBSS) for servers and hosts with the capability for packet capture, deep inspection, and customized signature capability.

  • Design and implement HW sensors into the Navy/Marine Corps architecture for on-call and future CND tools.

  • Design, plan, and implement actions on the enterprise as required by each of the Cyber Readiness Conditions.

  • Design and integrate Computer Network Defense (CND) mechanisms, including anti-spam tools, Network Access Control, HBSS, and HBSS Device Control Modules at Enterprise locations.

  • Assist with the development and integration of identity and access management requirements.

  • Execute Project Management tasks such as developing a Plan of Actions and Milestones (POA&M) for system compliance. 

  • Monitor and optimize replication speed of directory services. 

  • Oversee Rights Management Services for administrators, users and groups.

  • Perform tasks associated with application networking ports and protocols, Information Assurance (IA), routing and Local Area Network (LAN). 

  • Perform integration with Public Key Infrastructure (PKI) certificates and network accounts to support two-factor authentication for all Active Directory (AD) domain account categories and eliminate the need for password-based authentication.

  • Administer intrusion prevention. 

  • Perform Backup (Disaster Recovery).

  • Perform integration tasks using McAfee IPS and McAfee SIEM.

What Sets You Apart

  • Bachelor's Degree in Computer Science, MIS, Business, or related field

  • 10 years of related experience

  • Must possess and Information Assurance Technician (IAT) Level III

  • Must possess an Information Technology Infrastructure Library (ITIL)

  • US Citizen with an active DoD Secret Security Clearance

NGEN

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:May 4, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:Pay Range $107,900.00 - $195,050.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

Skills Required

  • Bachelor's Degree in Computer Science, MIS, Business, or related field
  • 10 years of related experience
  • Must possess an Information Assurance Technician (IAT) Level III
  • Must possess an Information Technology Infrastructure Library (ITIL)
  • US Citizen with an active DoD Secret Security Clearance

Leidos Compensation & Benefits Highlights

The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.

  • Healthcare Strength Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
  • Retirement Support Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
  • Wellbeing & Lifestyle Benefits Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.

Leidos Insights

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The Company
Alexandria, VA
27,104 Employees
Year Founded: 1969

What We Do

We Are Leidos For 50 years we have been tackling some of the biggest problems that face our nation and our world. OUR MISSION Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020. Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®. Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos. Your most important work is ahead.

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